import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_tts/flutter_tts.dart';
import 'dart:io' show Platform;

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final TextEditingController _textEditingController = TextEditingController(
      text:
          '亲爱的用户, 你好, 您这个月的水费金额为231元, 请尽快缴纳. 如有疑问, 请拨打电话 400-234-2344, 感谢您对水务的支持.');
  final FlutterTts _flutterTts = FlutterTts();
  bool _inputEnable = true;

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Container(
          padding: const EdgeInsets.fromLTRB(20, 0, 20, 0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              TextField(
                controller: _textEditingController,
                decoration:
                    const InputDecoration(labelText: 'Enter text to speech'),
                onSubmitted: onTextSubmit,
              ),
              ElevatedButton(
                onPressed: _inputEnable
                    ? () {
                        onTextSubmit(_textEditingController.text);
                      }
                    : null,
                child: const Text('Speech'),
              ),
            ],
          ),
        ),
      ),
    );
  }

  void onTextSubmit(String text) async {
    if (kIsWeb != true) {
      if (Platform.isIOS) {
        await _flutterTts.setSharedInstance(true);
      }
    }
    await _flutterTts.awaitSpeakCompletion(true);
    await _flutterTts.setLanguage('zh-CN');
    if (kIsWeb != true) {
      var voices = await _flutterTts.getVoices;
      print('vocices: $voices');
      //await _flutterTts.setSpeechRate(0.95);
      await _flutterTts.setVoice({"name": "Tian-Tian", "locale": "zh-CN"});
    }
    _flutterTts.setCompletionHandler(() {
      setState(() {
        _inputEnable = true;
      });
    });
    setState(() {
      _inputEnable = false;
    });
    await _flutterTts.speak(text);
  }
}
